20A outlets are used to work appliances and devices that have bigger electricity demands. That includes merchandise that work from the kitchen and laundry area, such as dishwashers and washing machines. You could recognize them with the little horizontal slot beside the vertical slot (Grounding). Older Japanese sockets and multi-plug https://typesofmicrophonesforreco30516.educationalimpactblog.com/51693752/all-types-of-electrical-plugs-fundamentals-explained